package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private SetmealMapper setmealMapper;

    // 添加购物车
    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //1、判断当前购物车的商品是否存在
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());
        // ！条件！查询当前用户购物车中，是否已添加过此商品  口味不同视为不同商品
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        //2、如果存在，则数量加1
        if(list != null && list.size() > 0){
            ShoppingCart cart = list.get(0);   //一个用户只能有一个购物车
            cart.setNumber(cart.getNumber() + 1); //update shoppingCard set number = (number + 1) where id = ?
            shoppingCartMapper.updateNumberById(cart);
        }else{
            //3、如果不存在，则添加到购物车，数量默认为1

            //判断本次添加的是菜品还是套餐
            Long dishId = shoppingCartDTO.getDishId();
            if(dishId != null){
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            }else{
                Long setmealId = shoppingCartDTO.getSetmealId();
                Setmeal setmeal = setmealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }



    }

    // 查询购物车数据
    @Override
    public List<ShoppingCart> showShoppingCard() {
        Long userId = BaseContext.getCurrentId();
        List<ShoppingCart> list = shoppingCartMapper.list(ShoppingCart.builder().userId(userId).build());
        return list;
    }

    // 删除购物车数据
    @Override
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //判断本次删除的是菜品还是套餐
        //菜品数量减1
        Long dishId = shoppingCartDTO.getDishId();
        ShoppingCart shoppingCart = new ShoppingCart();
        shoppingCart.setUserId(BaseContext.getCurrentId());
        if (dishId != null) {
            shoppingCart.setDishId(dishId);
            shoppingCart.setDishFlavor(shoppingCartDTO.getDishFlavor());
        }else{
            Long setmealId = shoppingCartDTO.getSetmealId();
            shoppingCart.setSetmealId(setmealId);
        }
        int count = shoppingCartMapper.count(shoppingCart);
        if (count == 1) {
            shoppingCartMapper.delete(shoppingCart);
        }else{
            shoppingCartMapper.subNumber(shoppingCart);
        }
    }

    // 清空购物车
    @Override
    public void clean() {
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.deleteAll(userId);
    }
}
